Adoption is broad. Many contributors are committing agent-authored work, which is what a real organisational rollout looks like.
Assisted or autonomous
Assisted — a developer’s identity authored the commit and the agent added itself as co-author. The agent ran git commit during a working session, with a person there. Autonomous — a bot identity is the author, no human in the loop. Across the whole index, 93.7% of agent commits are assisted.
Agent share by month
Peak month: 2.7%. Bars are scaled to that peak, not to 100%.
Which agents
| Claude Code | Anthropic | 41 | 1% |
| Cursor Agent | Anysphere | 9 | 0.2% |
| GitHub Copilot | GitHub | 4 | 0.1% |
Verify it yourself
Sample commits that matched. Every one links to GitHub — check the trailers.
4b86f1d3Make the password reveal button accessibleClaude Code43ed642cUpdate Take Take Take logo in OAuth flowsClaude Code5dbe7257Whitelist improvmx.com, an email forwarding serviceClaude Code85478a29Copy Crowdin context onto replacement i18n key comments.Cursor Agent071b48e2Copy preexisting Crowdin comments onto replacement keys.Cursor Agentb6e5978aRename replacement i18n keys to descriptive names.Cursor Agent450f42ceAdd keyboard shortcuts between analysis and editorGitHub Copilotb5752a83use nav.tour.officialGitHub Copilotc7d279e0fix grammatical errosGitHub Copilot
What was excluded
| Commits in window | 6,133 |
| Merge commits removed | −1,712 |
| CI / dependency bots removed | −115 |
| Considered | 4,306 |
Bots are excluded from the denominator entirely. Counting dependabot as “AI-written code” is the fastest way to produce a meaningless number.
How this was measured
Measured over February–August 2026, cloned directly. Detection is deterministic string matching against signatures agents write about themselves — no heuristics, no style analysis. Merge commits and CI bots are excluded from the denominator. The figure is a floor: squash merges strip trailers, so real usage is higher. Contributor counts are aggregate — no individual is named.
Run it yourself: npx qmmit-cli lichess-org/lila